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Table 3 Characteristics of RCTs with a positive response and negative or no response to the request for data sharing

From: Feasibility of individual patient data meta-analyses in orthopaedic surgery

Characteristics

Data sharing requesta (n = 263)

P value

n (%)

Positive response

Negative or no response

37 (14%)

226 (86%)

RCT characteristics

   

Study design

  

0.07

 Single-centre (n = 176)

19 (11%)

157 (89%)

 Multicentre (n = 57)

11 (19%)

46 (81%)

 Not reported (n = 30)

7 (23%)

23 (77%)

Location

  

0.11

 Europe (n = 105)

20 (19%)

85 (81%)

 North America (n = 71)

9 (13%)

62 (87%)

 Asia (n = 78)

6 (8%)

72 (92%)

 Australia and New Zealand (n = 9)

2 (22%)

7 (78%)

Funding

  

0.19

 Public (n = 91)

8 (9%)

83 (91%)

 

 Privateb (n = 45)

7 (16%)

38 (84%)

 No response (n = 127)

22 (17%)

105 (83%)

Year of publication

  

0.57

 2000–2004 (n = 44)

4 (9%)

40 (91%)

 2005–2009 (n = 109)

16 (15%)

93 (85%)

 2010–2013 (n = 110)

17 (15%)

93 (85%)

Journal of publication characteristics

   

Journal of publication

  

0.68

 Specialized (n = 251)

35 (14%)

216 (86%)

 Generalist (n = 12)

2 (17%)

10 (83%)

Journal data sharing policies

  

0.27

 Yes (support or mandatory) (n = 30)

2 (7%)

28 (93%)

 No (n = 233)

35 (15%)

198 (85%)

Top 10 impact factor in each specialty

  

0.21

 Yes (n = 117)

20 (17%)

97 (83%)

 No (n = 146)

17 (12%)

129 (88%)

  1. aTen trials excluded because our request was being evaluated by the research team or sponsor at the time of statistical analysis; btotal number (n = ) used for calculating the percentage